Slow RPC requests from Outlook.

Hello Everyone.
I have been working on an Exchange Server issue for a while. We have 90 users connected to a single exchange server and throughout the day the speed will periodically slow down to a crawl.

The first thing we did was too Migrate the Exchange server to a new server with 4 GB of ram instead of 2 GB and we split the drives into 2 volumes. the system volume is mirrored and the data volume is striped - Raid 5. Log files are on the system partition and the databases are on the data drive. This is Exchange Enterprise so we have split the Information Store into 5 seperate stores each 25 GB or less.

I am currently using /3GB /USERVA=3030 in the boot ini.

I have noticed that when I run RPC Slow Packets and Average RPC latency in the Performance monitor, the latency will increase dramtically and the number of slow packets can get as high as 16 to 20. Sometimes only for a few seconds, sometimes as long as a minute.

I am currently at a loss as to why this is happening. We do have 4 Entourage users and I have read that Entourage can cause speed issues with Exchange, so we are testing that now, but it is only 4 users out of 90.

Does anybody have any idea on what could be causing this?

One more thing is there are no errors in the event logs either in the system or application logs.

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